Itsnowedheavilyforthreedays_______

发布时间：2020-07-27 02:40:30

It snowed heavily for three days ________ and they were separated from the outside world．A.in the endB.on endC.by the endD.at the end

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B解析on end：连续地：大雪连续下了三天……；in the end：终于；by the end：到……末为止；at the end：在……重点。
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